#include<iostream>
#include<unistd.h>
#include<sys/types.h>
#include<sys/socket.h>
#include<netinet.h>
#include<netstat/in.h>
#include<arpa/inet.h>
#include<cstring>
#include<string>

namespace Net_Work
{
const static int defaultsockfd=-1;
const int backlog=5;

enum
{
    SocketError = 1,
    BindError,
    ListenError,
};

class Socket
{
    public:
    virtual ~Socket() {}
    virtual void CreateSocketOrDie()=0;
    virtual void BindSocketOrDie(uint16_t port)=0;
    virtual void ListenSocketOrDie(int backlog)=0;
    virtual Socket *AcceptConnection(std::string *peerip,uint16_t*peerport)=0;
    virtual bool ConnectServer(std::string&serverip,uint16_t serverport)=0;
    virtual int GetSockFd()=0;
    virtual void SetSockFd(int sockfd)=0;
    virtual void CloseSocket()=0;
    virtual bool Recv(std::string*buffer,int size)=0;
    virtual void Send(std::string send_str)=0;
    public:
    void BuildListenSocketMethod(uint16_t port,int backlog)
    {
        CreateSocketOrDie();
        BindSocketOrDie();
        ListenSocketOrDie();
    }
    bool BuildConnectSocketMethod(std::string&serverip,uint16_t port)
    {
        CreateSocketOrDie();
        return ConnectServer(serverip,port);
    }
    void BuildNormalSocketMethod(int sockfd)
    {
        SetSockFd(sockfd);
    }
};
class TcpSocket : public Socket
{
    public:
    TcpSocket(int sockfd=defaultsockfd):_sockfd(defaultsockfd) {};
    ~TcpSocket() {};
    void CreateSocketOrDie() override
    {
        _sockfd=socket(AF_INET,SOCK_STREAM,0);
        if(_sockfd<0)
        exit(SocketError);
    }
    void BindSocketOrDie(uint16_t port) override
    {
        struct sockaddr_in local;
        memset(&local,0,sizeof(local));
        local.sin_family=AF_INET;
        local.sin_addr.s_addr=INADDR_ANY;
        local.sin_port=htons(port);
        int n=bind(_sockfd,(struct sockaddr*)&local,sizeof local);
        if(n<0)
        {
            exit(BindError);
        }
    }
    void ListenSocketOrDie(int backlog) override
    {
        int n=listen(_sockfd,backlog);
        if(n<0)
         exit(ListenError);
    }
    Socket*AcceptConnection(std::string*peerip,uint16_t*peerport) override
    {
        struct sockaddr_in peer;
        socklen_t len=sizeof(peer);
        int newsockfd=accept(_sockfd,(struct sockaddr*)&peer,&len);
        if(newsockfd<0) return nullptr;
        *peerport=ntohs(peer.sin_port);
        *peerip=inet_ntoa(peer.sin_addr);
        Socket*s=new TcpSocket(newsockfd);
        return s;
    }
    bool ConnectServer(std::string&serverip,uint16_t serverport) override
    {
        struct sockaddr_in server;
        memset(&server,0,sizeof(server));
        server.sin_addr.s_addr=inet_addr(serverip.c_str());
        server.sin_port=htons(serverport);
        server.sin_family=AF_INET;
        int n=connect(_sockfd,(struct sockaddr*)&server,sizeof server);
        if(n==0) return true;
        else return false; 
    }
    int GetSockFd() override
    {
        return _sockfd;
    }
    void SetSockFd(int sockfd) override
    {
        _sockfd=sockfd;
    } 
    void CloseSock() override
    {
        if(_sockfd>defaultsockfd) close(_sockfd);
    }
    bool Recv(std::string *buffer,int size) override
    {
        char inbuffer[size];
        ssize_t n=recv(_sockfd,inbuffer,size-1,0);
        if(n>0)
        {
            inbuffer[n]=0;
            *buffer+=inbuffer;
            return true;
        }
        if(n==0) return false;
        else return false;
    }
    void Send(std::string&send_str) override
    {
        send(_sockfd,send_str.c_str(),send_str.size());
    }
    private:
    int _sockfd;
};
}